10 Pooling via gearman vs http I haven t compared them in use myself yet + Gearman may have lower latency + Gearman spreads load over multiple machines without need for load-balancer + Gearman coalescing may be beneficial + Gearman async client may work well with POE - Gearman clients need to be told about servers More gearman info 2007_04_linuxfest_nw/linuxfest.pdf (p61+) 10

11 DBD::Gofer A proxy driver Accumulates details of DBI method calls Delays forwarding request for as long as possible Aims to be as transparent as possible Policy mechanism allows fine-grained tuning to trade transparency for speed execute_array() is a single round-trip 11

12 DBD::Gofer::Policy::* Three policies supplied: pedantic, classic, and rush. Classic is the default. Policies are implemented as classes Currently 22 individual items within a policy Policy items can be dynamic methods Policy is selected via DSN: DBI_AUTOPROXY= dbi:gofer:transport=null ;policy=pedantic 12

24 Future: JSON Turns DBI into a web service! - Service Oriented Architecture anyone? Accessible to anything - that can talk JSON Clients could be JavaScript, Java,... - and various languages that begin with P or Patches welcome! 24

25 Future: Client Caching DBD::Gofer could access a cache - Use serialized request as key to cache - If entry found then return that response Plug-able caching - Would include memcached to give a distributed shared cache Patches welcome! 25

26 Future: Transactions State-less-ness could be made optional - If transport layer being used agrees - For http that means KeepAlive - Easiest to implement for stream / ssh Would be enabled by AutoCommit => 0 $dbh->begin_work Patches welcome! 26

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